Oxygen Free Copper cables
...are a real thing. In industrial applications.
I used to use hugely expensive OFC between my crap stereo and speakers, because I'd stolen it and it gave me bragging rights over audio snobs.
My second design engineer project in the '80s was VMEbus cables ribbon that sold for hundreds of pounds, which was a huge come down because my first was a VMEbus board that sold for thousands. It was actually trickier than I'd thought. You had to pair signals on wires to avoid crosstalk, shield the cable at only one end, split them so they could take more strain.
I considered myself a digital design engineer, not an analogue engineer, and suddenly I was immersed in the weird and frightening world of RF engineering.